/* Blob.js
 * A Blob, File, FileReader & URL implementation.
 * 2019-04-19
 *
 * By Eli Grey, http://eligrey.com
 * By Jimmy Wärting, https://github.com/jimmywarting
 * License: MIT
 *   See https://github.com/eligrey/Blob.js/blob/master/LICENSE.md
 */

;(function () {
    var global = typeof window === 'object'
        ? window : typeof self === 'object'
        ? self : this
  
    var BlobBuilder = global.BlobBuilder
      || global.WebKitBlobBuilder
      || global.MSBlobBuilder
      || global.MozBlobBuilder
  
    global.URL = global.URL || global.webkitURL || function (href, a) {
        a = document.createElement('a')
        a.href = href
        return a
    }
  
    var origBlob = global.Blob
    var createObjectURL = URL.createObjectURL
    var revokeObjectURL = URL.revokeObjectURL
    var strTag = global.Symbol && global.Symbol.toStringTag
    var blobSupported = false
    var blobSupportsArrayBufferView = false
    var arrayBufferSupported = !!global.ArrayBuffer
    var blobBuilderSupported = BlobBuilder
      && BlobBuilder.prototype.append
      && BlobBuilder.prototype.getBlob
  
    try {
      // Check if Blob constructor is supported
      blobSupported = new Blob(['ä']).size === 2
  
      // Check if Blob constructor supports ArrayBufferViews
      // Fails in Safari 6, so we need to map to ArrayBuffers there.
      blobSupportsArrayBufferView = new Blob([new Uint8Array([1, 2])]).size === 2
    } catch (e) {}
  
    /**
     * Helper function that maps ArrayBufferViews to ArrayBuffers
     * Used by BlobBuilder constructor and old browsers that didn't
     * support it in the Blob constructor.
     */
    function mapArrayBufferViews (ary) {
      return ary.map(function (chunk) {
        if (chunk.buffer instanceof ArrayBuffer) {
          var buf = chunk.buffer
  
          // if this is a subarray, make a copy so we only
          // include the subarray region from the underlying buffer
          if (chunk.byteLength !== buf.byteLength) {
            var copy = new Uint8Array(chunk.byteLength)
            copy.set(new Uint8Array(buf, chunk.byteOffset, chunk.byteLength))
            buf = copy.buffer
          }
  
          return buf
        }
  
        return chunk
      })
    }
  
    function BlobBuilderConstructor (ary, options) {
      options = options || {}
  
      var bb = new BlobBuilder()
      mapArrayBufferViews(ary).forEach(function (part) {
        bb.append(part)
      })
  
      return options.type ? bb.getBlob(options.type) : bb.getBlob()
    }
  
    function BlobConstructor (ary, options) {
      return new origBlob(mapArrayBufferViews(ary), options || {})
    }
  
    if (global.Blob) {
      BlobBuilderConstructor.prototype = Blob.prototype
      BlobConstructor.prototype = Blob.prototype
    }
  
  
  
    /********************************************************/
    /*               String Encoder fallback                */
    /********************************************************/
    function stringEncode (string) {
      var pos = 0
      var len = string.length
      var Arr = global.Uint8Array || Array // Use byte array when possible
  
      var at = 0  // output position
      var tlen = Math.max(32, len + (len >> 1) + 7)  // 1.5x size
      var target = new Arr((tlen >> 3) << 3)  // ... but at 8 byte offset
  
      while (pos < len) {
        var value = string.charCodeAt(pos++)
        if (value >= 0xd800 && value <= 0xdbff) {
          // high surrogate
          if (pos < len) {
            var extra = string.charCodeAt(pos)
            if ((extra & 0xfc00) === 0xdc00) {
              ++pos
              value = ((value & 0x3ff) << 10) + (extra & 0x3ff) + 0x10000
            }
          }
          if (value >= 0xd800 && value <= 0xdbff) {
            continue  // drop lone surrogate
          }
        }
  
        // expand the buffer if we couldn't write 4 bytes
        if (at + 4 > target.length) {
          tlen += 8  // minimum extra
          tlen *= (1.0 + (pos / string.length) * 2)  // take 2x the remaining
          tlen = (tlen >> 3) << 3  // 8 byte offset
  
          var update = new Uint8Array(tlen)
          update.set(target)
          target = update
        }
  
        if ((value & 0xffffff80) === 0) {  // 1-byte
          target[at++] = value  // ASCII
          continue
        } else if ((value & 0xfffff800) === 0) {  // 2-byte
          target[at++] = ((value >> 6) & 0x1f) | 0xc0
        } else if ((value & 0xffff0000) === 0) {  // 3-byte
          target[at++] = ((value >> 12) & 0x0f) | 0xe0
          target[at++] = ((value >> 6) & 0x3f) | 0x80
        } else if ((value & 0xffe00000) === 0) {  // 4-byte
          target[at++] = ((value >> 18) & 0x07) | 0xf0
          target[at++] = ((value >> 12) & 0x3f) | 0x80
          target[at++] = ((value >> 6) & 0x3f) | 0x80
        } else {
          // FIXME: do we care
          continue
        }
  
        target[at++] = (value & 0x3f) | 0x80
      }
  
      return target.slice(0, at)
    }
  
    /********************************************************/
    /*               String Decoder fallback                */
    /********************************************************/
    function stringDecode (buf) {
      var end = buf.length
      var res = []
  
      var i = 0
      while (i < end) {
        var firstByte = buf[i]
        var codePoint = null
        var bytesPerSequence = (firstByte > 0xEF) ? 4
          : (firstByte > 0xDF) ? 3
            : (firstByte > 0xBF) ? 2
              : 1
  
        if (i + bytesPerSequence <= end) {
          var secondByte, thirdByte, fourthByte, tempCodePoint
  
          switch (bytesPerSequence) {
            case 1:
              if (firstByte < 0x80) {
                codePoint = firstByte
              }
              break
            case 2:
              secondByte = buf[i + 1]
              if ((secondByte & 0xC0) === 0x80) {
                tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
                if (tempCodePoint > 0x7F) {
                  codePoint = tempCodePoint
                }
              }
              break
            case 3:
              secondByte = buf[i + 1]
              thirdByte = buf[i + 2]
              if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
                tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
                if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                  codePoint = tempCodePoint
                }
              }
              break
            case 4:
              secondByte = buf[i + 1]
              thirdByte = buf[i + 2]
              fourthByte = buf[i + 3]
              if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
                tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
                if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                  codePoint = tempCodePoint
                }
              }
          }
        }
  
        if (codePoint === null) {
          // we did not generate a valid codePoint so insert a
          // replacement char (U+FFFD) and advance only 1 byte
          codePoint = 0xFFFD
          bytesPerSequence = 1
        } else if (codePoint > 0xFFFF) {
          // encode to utf16 (surrogate pair dance)
          codePoint -= 0x10000
          res.push(codePoint >>> 10 & 0x3FF | 0xD800)
          codePoint = 0xDC00 | codePoint & 0x3FF
        }
  
        res.push(codePoint)
        i += bytesPerSequence
      }
  
      var len = res.length
      var str = ''
      var i = 0
  
      while (i < len) {
        str += String.fromCharCode.apply(String, res.slice(i, i += 0x1000))
      }
  
      return str
    }
  
    // string -> buffer
    var textEncode = typeof TextEncoder === 'function'
      ? TextEncoder.prototype.encode.bind(new TextEncoder())
      : stringEncode
  
    // buffer -> string
    var textDecode = typeof TextDecoder === 'function'
      ? TextDecoder.prototype.decode.bind(new TextDecoder())
      : stringDecode
  
    function FakeBlobBuilder () {
      function isDataView (obj) {
        return obj && DataView.prototype.isPrototypeOf(obj)
      }
      function bufferClone (buf) {
        var view = new Array(buf.byteLength)
        var array = new Uint8Array(buf)
        var i = view.length
        while (i--) {
          view[i] = array[i]
        }
        return view
      }
      function array2base64 (input) {
        var byteToCharMap = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
  
        var output = []
  
        for (var i = 0; i < input.length; i += 3) {
          var byte1 = input[i]
          var haveByte2 = i + 1 < input.length
          var byte2 = haveByte2 ? input[i + 1] : 0
          var haveByte3 = i + 2 < input.length
          var byte3 = haveByte3 ? input[i + 2] : 0
  
          var outByte1 = byte1 >> 2
          var outByte2 = ((byte1 & 0x03) << 4) | (byte2 >> 4)
          var outByte3 = ((byte2 & 0x0F) << 2) | (byte3 >> 6)
          var outByte4 = byte3 & 0x3F
  
          if (!haveByte3) {
            outByte4 = 64
  
            if (!haveByte2) {
              outByte3 = 64
            }
          }
  
          output.push(
            byteToCharMap[outByte1], byteToCharMap[outByte2],
            byteToCharMap[outByte3], byteToCharMap[outByte4]
          )
        }
  
        return output.join('')
      }
  
      var create = Object.create || function (a) {
        function c () {}
        c.prototype = a
        return new c()
      }
  
      if (arrayBufferSupported) {
        var viewClasses = [
          '[object Int8Array]',
          '[object Uint8Array]',
          '[object Uint8ClampedArray]',
          '[object Int16Array]',
          '[object Uint16Array]',
          '[object Int32Array]',
          '[object Uint32Array]',
          '[object Float32Array]',
          '[object Float64Array]'
        ]
  
        var isArrayBufferView = ArrayBuffer.isView || function (obj) {
          return obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1
        }
      }
  
      function concatTypedarrays (chunks) {
        var size = 0
        var i = chunks.length
        while (i--) { size += chunks[i].length }
        var b = new Uint8Array(size)
        var offset = 0
        for (i = 0, l = chunks.length; i < l; i++) {
          var chunk = chunks[i]
          b.set(chunk, offset)
          offset += chunk.byteLength || chunk.length
        }
  
        return b
      }
  
      /********************************************************/
      /*                   Blob constructor                   */
      /********************************************************/
      function Blob (chunks, opts) {
        chunks = chunks || []
        opts = opts == null ? {} : opts
        for (var i = 0, len = chunks.length; i < len; i++) {
          var chunk = chunks[i]
          if (chunk instanceof Blob) {
            chunks[i] = chunk._buffer
          } else if (typeof chunk === 'string') {
            chunks[i] = textEncode(chunk)
          } else if (arrayBufferSupported && (ArrayBuffer.prototype.isPrototypeOf(chunk) || isArrayBufferView(chunk))) {
            chunks[i] = bufferClone(chunk)
          } else if (arrayBufferSupported && isDataView(chunk)) {
            chunks[i] = bufferClone(chunk.buffer)
          } else {
            chunks[i] = textEncode(String(chunk))
          }
        }
  
        this._buffer = global.Uint8Array
          ? concatTypedarrays(chunks)
          : [].concat.apply([], chunks)
        this.size = this._buffer.length
  
        this.type = opts.type || ''
        if (/[^\u0020-\u007E]/.test(this.type)) {
          this.type = ''
        } else {
          this.type = this.type.toLowerCase()
        }
      }
  
      Blob.prototype.arrayBuffer = function () {
        return Promise.resolve(this._buffer)
      }
  
      Blob.prototype.text = function () {
        return Promise.resolve(textDecode(this._buffer))
      }
  
      Blob.prototype.slice = function (start, end, type) {
        var slice = this._buffer.slice(start || 0, end || this._buffer.length)
        return new Blob([slice], {type: type})
      }
  
      Blob.prototype.toString = function () {
        return '[object Blob]'
      }
  
      /********************************************************/
      /*                   File constructor                   */
      /********************************************************/
      function File (chunks, name, opts) {
        opts = opts || {}
        var a = Blob.call(this, chunks, opts) || this
        a.name = name.replace(/\//g, ':')
        a.lastModifiedDate = opts.lastModified ? new Date(opts.lastModified) : new Date()
        a.lastModified = +a.lastModifiedDate
  
        return a
      }
  
      File.prototype = create(Blob.prototype)
      File.prototype.constructor = File
  
      if (Object.setPrototypeOf) {
        Object.setPrototypeOf(File, Blob)
      } else {
        try { File.__proto__ = Blob } catch (e) {}
      }
  
      File.prototype.toString = function () {
        return '[object File]'
      }
  
      /********************************************************/
      /*                FileReader constructor                */
      /********************************************************/
      function FileReader () {
          if (!(this instanceof FileReader)) {
          throw new TypeError("Failed to construct 'FileReader': Please use the 'new' operator, this DOM object constructor cannot be called as a function.")
        }
  
          var delegate = document.createDocumentFragment()
          this.addEventListener = delegate.addEventListener
          this.dispatchEvent = function (evt) {
              var local = this['on' + evt.type]
              if (typeof local === 'function') local(evt)
              delegate.dispatchEvent(evt)
          }
          this.removeEventListener = delegate.removeEventListener
      }
  
      function _read (fr, blob, kind) {
          if (!(blob instanceof Blob)) {
          throw new TypeError("Failed to execute '" + kind + "' on 'FileReader': parameter 1 is not of type 'Blob'.")
        }
  
          fr.result = ''
  
          setTimeout(function () {
              this.readyState = FileReader.LOADING
              fr.dispatchEvent(new Event('load'))
              fr.dispatchEvent(new Event('loadend'))
          })
      }
  
      FileReader.EMPTY = 0
      FileReader.LOADING = 1
      FileReader.DONE = 2
      FileReader.prototype.error = null
      FileReader.prototype.onabort = null
      FileReader.prototype.onerror = null
      FileReader.prototype.onload = null
      FileReader.prototype.onloadend = null
      FileReader.prototype.onloadstart = null
      FileReader.prototype.onprogress = null
  
      FileReader.prototype.readAsDataURL = function (blob) {
          _read(this, blob, 'readAsDataURL')
          this.result = 'data:' + blob.type + ';base64,' + array2base64(blob._buffer)
      }
  
      FileReader.prototype.readAsText = function (blob) {
          _read(this, blob, 'readAsText')
          this.result = textDecode(blob._buffer)
      }
  
      FileReader.prototype.readAsArrayBuffer = function (blob) {
        _read(this, blob, 'readAsText')
         // return ArrayBuffer when possible
        this.result = (blob._buffer.buffer || blob._buffer).slice()
      }
  
      FileReader.prototype.abort = function () {}
  
      /********************************************************/
      /*                         URL                          */
      /********************************************************/
      URL.createObjectURL = function (blob) {
        return blob instanceof Blob
          ? 'data:' + blob.type + ';base64,' + array2base64(blob._buffer)
          : createObjectURL.call(URL, blob)
      }
  
      URL.revokeObjectURL = function (url) {
        revokeObjectURL && revokeObjectURL.call(URL, url)
      }
  
      /********************************************************/
      /*                         XHR                          */
      /********************************************************/
      var _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
      if (_send) {
        XMLHttpRequest.prototype.send = function (data) {
          if (data instanceof Blob) {
            this.setRequestHeader('Content-Type', data.type)
            _send.call(this, textDecode(data._buffer))
          } else {
            _send.call(this, data)
          }
        }
      }
  
      global.FileReader = FileReader
      global.File = File
      global.Blob = Blob
    }
  
    function fixFileAndXHR () {
      var isIE = !!global.ActiveXObject || (
        '-ms-scroll-limit' in document.documentElement.style &&
        '-ms-ime-align' in document.documentElement.style
      )
  
      // Monkey patched
      // IE don't set Content-Type header on XHR whose body is a typed Blob
      // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/6047383
      var _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
      if (isIE && _send) {
        XMLHttpRequest.prototype.send = function (data) {
          if (data instanceof Blob) {
            this.setRequestHeader('Content-Type', data.type)
            _send.call(this, data)
          } else {
            _send.call(this, data)
          }
        }
      }
  
      try {
        new File([], '')
      } catch (e) {
        try {
          var klass = new Function('class File extends Blob {' +
            'constructor(chunks, name, opts) {' +
              'opts = opts || {};' +
              'super(chunks, opts || {});' +
              'this.name = name.replace(/\//g, ":");' +
              'this.lastModifiedDate = opts.lastModified ? new Date(opts.lastModified) : new Date();' +
              'this.lastModified = +this.lastModifiedDate;' +
            '}};' +
            'return new File([], ""), File'
          )()
          global.File = klass
        } catch (e) {
          var klass = function (b, d, c) {
            var blob = new Blob(b, c)
            var t = c && void 0 !== c.lastModified ? new Date(c.lastModified) : new Date()
  
            blob.name = d.replace(/\//g, ':')
            blob.lastModifiedDate = t
            blob.lastModified = +t
            blob.toString = function () {
              return '[object File]'
            }
  
            if (strTag) {
              blob[strTag] = 'File'
            }
  
            return blob
          }
          global.File = klass
        }
      }
    }
  
    if (blobSupported) {
      fixFileAndXHR()
      global.Blob = blobSupportsArrayBufferView ? global.Blob : BlobConstructor
    } else if (blobBuilderSupported) {
      fixFileAndXHR()
      global.Blob = BlobBuilderConstructor
    } else {
      FakeBlobBuilder()
    }
  
    if (strTag) {
      File.prototype[strTag] = 'File'
      Blob.prototype[strTag] = 'Blob'
      FileReader.prototype[strTag] = 'FileReader'
    }
  
    var blob = global.Blob.prototype
    var stream
  
    function promisify(obj) {
      return new Promise(function(resolve, reject) {
        obj.onload =
        obj.onerror = function(evt) {
          obj.onload =
          obj.onerror = null
  
          evt.type === 'load'
            ? resolve(obj.result || obj)
            : reject(new Error('Failed to read the blob/file'))
        }
      })
    }
  
  
    try {
      new ReadableStream({ type: 'bytes' })
      stream = function stream() {
        var position = 0
        var blob = this
  
        return new ReadableStream({
          type: 'bytes',
          autoAllocateChunkSize: 524288,
  
          pull: function (controller) {
            var v = controller.byobRequest.view
            var chunk = blob.slice(position, position + v.byteLength)
            return chunk.arrayBuffer()
            .then(function (buffer) {
              var uint8array = new Uint8Array(buffer)
              var bytesRead = uint8array.byteLength
  
              position += bytesRead
              v.set(uint8array)
                controller.byobRequest.respond(bytesRead)
  
              if(position >= blob.size)
                controller.close()
            })
          }
        })
      }
    } catch (e) {
      try {
        new ReadableStream({})
        stream = function stream(blob){
          var position = 0
          var blob = this
  
          return new ReadableStream({
            pull: function (controller) {
              var chunk = blob.slice(position, position + 524288)
  
              return chunk.arrayBuffer().then(function (buffer) {
                position += buffer.byteLength
                var uint8array = new Uint8Array(buffer)
                controller.enqueue(uint8array)
  
                if (position == blob.size)
                  controller.close()
              })
            }
          })
        }
      } catch (e) {
        try {
          new Response('').body.getReader().read()
          stream = function stream() {
            return (new Response(this)).body
          }
        } catch (e) {
          stream = function stream() {
            throw new Error('Include https://github.com/MattiasBuelens/web-streams-polyfill')
          }
        }
      }
    }
  
  
    if (!blob.arrayBuffer) {
      blob.arrayBuffer = function arrayBuffer() {
        var fr = new FileReader()
        fr.readAsArrayBuffer(this)
        return promisify(fr)
      }
    }
  
    if (!blob.text) {
      blob.text = function text() {
        var fr = new FileReader()
        fr.readAsText(this)
        return promisify(fr)
      }
    }
  
    if (!blob.stream) {
      blob.stream = stream
    }
  })()